The wind speed that is considered dangerous for boating depends on various factors such as the size and type of boat, the experience and skill level of the boater, and the conditions of the waterbody. Generally, winds above 20 knots (23 miles per hour or 37 kilometers per hour) can make boating conditions challenging and potentially hazardous, particularly for small boats. Wind speeds above 25 knots (29 miles per hour or 46 kilometers per hour) are often considered dangerous for most recreational boaters.
However, it's important to note that boating safety guidelines may vary depending on the region, local regulations, and the specific characteristics of the waterway. Boaters should always consult local weather forecasts and follow the recommendations of boating authorities or the U.S. Coast Guard (or its equivalent in your country) regarding safe boating practices and wind speed limits for their specific location and vessel. Additionally, factors such as wave height, tidal currents, and the presence of other environmental conditions can further affect the safety of boating in windy conditions.